The problem with the proposed solution of verifying ID is that people who leave honest bad reviews often enough get harassment sued by angry dishonest business owners, who it turns out are more likely to harass and sue companies than the honest companies are.

The main problem here is that Yelp is a racket as well, this has been known for some time. Those using it, well caveat emptor.

There are other review sites out there that are not as morally compromised as Yelp due to their business model being modeled on a mafia protection racket of "Pay us and we can help these bad reviews go away."